使用|accessdate=需要含有|url= (帮助) The Development and Principles of UK Signalling. Railway Technical. [October 21, 2014]. (原始内容存档于October 21, 2014). BO23 Brochure
Transmission)是一套依靠Distance-To-Go模式運作,並以數據傳輸為本的鐵路訊號系統(Transmission Based Signalling,TBS),等同ETCS等級一/二訊號系統。此系統由比利時沙勒羅亞電機工程(ACEC)(英语:Ateliers de Constructions